Question
The ratio of the speed of boats ‘A’ and ‘B’ in
still water is 8:9, respectively. The speed of the current is 25% of the speed of boat ‘A’ in still water. If boat ‘A’ takes 10 hours to travel 500 km downstream, then find the time taken by boat ‘B’ to travel 70 km upstream and 275 km downstream. (Note: Both the boats are rowing in the same stream.)Solution
Let the speeds of boats ‘A’ and ‘B’ in still water be 8x km/hr and 9x km/hr Therefore, speed of the current = 0.25 × 8x = 2x km/hr According to the question, 8x + 2x = 500/10 Or, 10x = 50 Or, x = 5 Therefore, upstream speed of boat ‘B’ = 9x – 2x = 7x = 35 km/hr Downstream speed of boat ‘B’ = 9x + 2x = 11x = 55 km/hr Required time taken = (70/35) + (275/55) = 2 + 5 = 7 hours
In the following question, select the related word from the given alternatives.
BURIED : SNGCZX :: LEGAL : ?
Select the option that is related to the third word in the same way as the second word is related to the first word.
Brave : Coward :: Honest : ?
If D = 12, AGE = 39, then ‘JADE’ will be equal to?
If 42 @ 21 = 18' and 35 @ 27 = 18', then 46 @ 32 = ?'. What will come in place of question mark?
8, 20, 48, 108, 232, 482
- Select the option that is related to the third term in the same way as the second term is related to first term and the sixth term is related to the Fifth ...
Select the set in which the numbers are related in the same way as are the numbers of the following set. (NOTE: Operations should be performed on the wh...
Select the option that is related to third letter cluster in the same way second letter cluster is related to first letter cluster.
REASON: WVF...
Select the related number from the given alternatives.
42 : 12 :: 96 : ?
- Select the set in which the numbers are related in the same way as are the numbers of the following set.
(9, 11, 40)
(15, 7, 176)
